<template>
  <div class="player" v-show="playlist.length>0">
      <transition name="normal" 
                  @enter="enter"
                  @after-enter="afterEnter"
                  @leave="leave"
                  @after-leave="afterLeave"
      >
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
            <img width="100%" height="100%" :src="currentSong.image">
        </div>
        <div class="top">
            <div class="back" @click="back">
                <i class="icon-back"></i>
            </div>
            <h1 class="title" v-html="currentSong.name"></h1>
            <h2 class="subtitle" v-html="currentSong.singer"></h2>
        </div>
        <div class="middle" 
             @touchstart.prevent="middleTouchStart"
             @touchmove.prevent="middleTouchMove"
             @touchend="middleTouchEnd"
             >
            <div class="middle-l" ref="middleL">
                <div class="cd-wrapper" ref="cdWrapper">
                    <div class="cd" :class="cdCls">
                        <img class="image" :src="currentSong.image">
                    </div>
                </div>
                <div class="playing-lyric-wrapper">
                    <div class="playing-lyric">{{playingLyric}}</div>
                </div>
            </div>
            <scroll class="middle-r" ref="lyricList"
             :data="currentLyric&&currentLyric.lines">
                <div class="lyric-wrapper">
                    <div v-if="currentLyric">
                        <p ref="lyricLine"
                           class="text"
                           :class="{'current':currentLineNum===index}"
                           v-for="(line,index) in currentLyric.lines" >{{line.txt}}</p>
                    </div>
                </div>
            </scroll>
        </div>
        <div class="bottom">
            <div class="dot-wrapper">
                <span class="dot" :class="{'active':currentShow==='cd'}"></span>
                <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
            </div>
            <div class="progress-wrapper">
                <span class="time time-l">{{format(currentTime)}}</span>
                <div class="progress-bar-wrapper">
                     <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
                </div>
                <span class="time time-r">{{format(currentSong.duration)}}</span>
            </div>
            <div class="operators">
                <div class="icon i-left" @click="changeMode">
                    <i :class="iconMode"></i>
                </div>
                <div class="icon i-left" :class="disabelCls">
                    <i @click="prev" class="icon-prev"></i>
                </div>
                <div class="icon i-center" :class="disabelCls">
                    <i @click="togglePlaying" :class="playIcon"></i>
                </div>
                <div class="icon i-right" :class="disabelCls">
                    <i @click="next" class="icon-next"></i>
                </div>
                <div class="icon i-right">
                    <i class="icon icon-not-favorite"></i>
                </div>
            </div>
        </div>
      </div>
      </transition>
      <transition name="mini">
      <div class="mini-player" v-show="!fullScreen" @click="open">
          <div class="icon">
              <img :class="cdCls" width="40" height="40" :src="currentSong.image">
          </div>
          <div class="text">
              <h2 class="name" v-html="currentSong.name"></h2>
              <p class="desc" v-html="currentSong.singer"></p>
          </div>
          <div class="control">
              <progress-circle>
                 <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
              </progress-circle>
          </div>
          <div class="control">
              <i class="icon-playlist"></i>
          </div>
      </div>
      </transition>
      <audio @ended="end" @timeupdate="updateTime" ref="audio" :src="currentSong.url" @canplay="ready" @error="error" ></audio>
  </div>
</template>
<script type="text/ecmascript-6">
import { mapGetters, mapMutations } from "vuex";
import animations from "create-keyframe-animation";
import { prefixStyle } from "common/js/dom";
import ProgressBar from "base/progress-bar/progress-bar";
import ProgressCircle from 'base/progress-circle/progress-circle'
import {playMode} from 'common/js/config'
import {shuffle} from 'common/js/util'
import Lyric from 'lyric-parser'
import Scroll from 'base/scroll/scroll'

const transform = prefixStyle("transform");
const transitionDuration = prefixStyle("transitionDuration");
export default {
  data() {
    return {
      songReady: false,
      currentTime: 0,
      radius:32,
      currentLyric:null,
      currentLineNum:0,
      currentShow:'cd',
      playingLyric:''
    };
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll
  },
  computed: {
    percent() {
      return this.currentTime / this.currentSong.duration;
    },
    cdCls() {
      return this.playing ? "play" : "play pause";
    },
    iconMode(){
        return this.mode=== playMode.sequence?'icon-sequence':
        this.mode===playMode.loop?'icon-loop':'icon-random'
    },
    playIcon() {
      return this.playing ? "icon-pause" : "icon-play";
    },
    miniIcon() {
      return this.playing ? "icon-pause-mini" : "icon-play-mini";
    },
    disabelCls() {
      return this.songReady ? "" : "disable";
    },
    ...mapGetters([
      "fullScreen",
      "playlist",
      "currentSong",
      "playing",
      "currentIndex",
      'mode',
      'sequenceList'
    ])
  },
  created(){
      this.touch={}
  },
  methods: {
    changeMode(){
        const mode=(this.mode+1)%3
        this.setPlayMode(mode)
        let list=null
        if(mode===playMode.random){
            list =shuffle(this.sequenceList)
        }else{
            list =this.sequenceList
        }
        this.resetCurrentIndex(list)
        this.setPlaylist(list)
    },
    resetCurrentIndex(list){
        let index=list.findIndex((item)=>{
            return item.id=== this.currentSong.id
        })
        this.setCurrentIndex(index)
    },
    getLyric(){
        this.currentSong.getLyric().then((lyric)=>{
            this.currentLyric=new Lyric(lyric,this.handleLyric)
            if(this.playing){
            this.currentLyric.play()
            }
            console.log(this.currentLyric)
        }).catch(()=>{
            this.currentLyric=null
            this.playingLyric=''
            this.currentLineNum=0
        })
    },
    handleLyric({lineNum,txt}){
        this.currentLineNum=lineNum
        if(lineNum>5){
            let lineEl=this.$refs.lyricLine[lineNum-5]
            this.$refs.lyricList.scrollToElement(lineEl,1000)
        }else{
            this.$refs.lyricList.scrollTo(0,0,1000)
        }
        this.playingLyric=txt
    },
    onProgressBarChange(percent) {
      const currentTime = this.currentSong.duration * percent;
      this.$refs.audio.currentTime = currentTime;
      if (!this.playing) {
        this.togglePlaying();
      }
      if(this.currentLyric){
          this.currentLyric.seek(currentTime*1000)
      }
      // 点击或滑动 歌曲进度条 歌词滚动到对应的位置
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000);
      }
    },
    back() {
      this.setFullScreen(false);
    },
    open() {
      this.setFullScreen(true);
    },
    enter(el, done) {
      const { x, y, scale } = this._getPosAndScale();

      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      };

      animations.registerAnimation({
        name: "move",
        animation,
        presets: {
          duration: 400,
          easing: "linear"
        }
      });

      animations.runAnimation(this.$refs.cdWrapper, "move", done);
    },
    afterEnter() {
      animations.unregisterAnimation("move");
      this.$refs.cdWrapper.style.animation = "";
    },
    leave(el, done) {
      this.$refs.cdWrapper.style.transition = "all 0.4s";
      const { x, y, scale } = this._getPosAndScale();
      this.$refs.cdWrapper.style[
        transform
      ] = `translate3d(${x}px,${y}px,0) scale(${scale})`;
      this.$refs.cdWrapper.addEventListener("transitionend", done);
    },
    afterLeave() {
      this.$refs.cdWrapper.style.transform = "";
      this.$refs.cdWrapper.style[transform] = "";
    },
    togglePlaying() {
      if (!this.songReady) {
        return;
      }
      this.setPlayingState(!this.playing)
      if(this.currentLyric){
            this.currentLyric.togglePlay()
        }
    },
    end(){
        if(this.mode===playMode.loop){
            this.loop()
        }else{
            this.next()
        }
    },
    loop(){
        this.$refs.audio.currentTime=0
        this.$refs.audio.play()
        if(this.currentLyric){
            this.currentLyric.seek(0)
        }
    },
    next() {
      if (!this.songReady) {
        return;
      }
      if(this.playlist.length===1){
          this.loop()
      }else{
      let index = this.currentIndex + 1;
      if (index === this.playlist.length) {
        index = 0;
      }
      this.setCurrentIndex(index);
      if (!this.playing) {
        this.togglePlaying();
      }
    }
      this.songReady = false;
    },
    prev() {
      if (!this.songReady) {
        return;
      }
      if(this.playlist.length===1){
          this.loop()
      }else{
      let index = this.currentIndex - 1;
      if (index === -1) {
        index = this.playlist.length - 1;
      }
      this.setCurrentIndex(index);
      if (!this.playing) {
        this.togglePlaying();
      }
    }
      this.songReady = false;
    },
    ready() {
      this.songReady = true;
    },
    error() {
      this.songReady = true;
    },
    updateTime(e) {
      this.currentTime = e.target.currentTime;
    },
    format(interval) {
      interval = interval | 0;
      const minute = (interval / 60) | 0;
      const second = this._pad(interval % 60);
      return `${minute}:${second}`;
    },
    middleTouchStart(e){
        this.touch.initiated=true
        const touch=e.touches[0]
        this.touch.startX=touch.pageX
        this.touch.startY=touch.pageY
    },
    middleTouchMove(e){
        if(!this.touch.initiated){
        return
        }
        const touch =e.touches[0]
        const deltaX=touch.pageX-this.touch.startX
        const deltaY=touch.pageY-this.touch.startY
        if(Math.abs(deltaY)>Math.abs(deltaX)){
            return
        }
        const left =this.currentShow==='cd'?0:-window.innerWidth
        const offsetwidth=Math.min(0,Math.max(-window.innerWidth,left+deltaX))
        this.touch.percent=Math.abs(offsetwidth/window.innerWidth)
        this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetwidth}px,0,0)`
        this.$refs.lyricList.$el.style[transitionDuration]=0
        this.$refs.middleL.style.opacity=1-this.touch.percent
        this.$refs.middleL.style[transitionDuration]=0
    },
    middleTouchEnd(e){
        let offsetwidth
        let opacity
        if(this.currentShow==='cd'){
            if(this.touch.percent>0.1){
                offsetwidth=-window.innerWidth
                opacity=0
                this.currentShow='lyric'
            }else{
                offsetwidth=0
                opacity=1
            }
        }else{
            if(this.touch.percent<0.9){
                    offsetwidth=0
                    this.currentShow='cd'
                    opacity=1
                }else{
                    offsetwidth=-window.innerWidth
                    opacity=0
                }
            }
            const time=500
            this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetwidth}px,0,0)` 
            this.$refs.lyricList.$el.style[transitionDuration]=`${time}ms`
            this.$refs.middleL.style.opacity=opacity
            this.$refs.middleL.style[transitionDuration]=`${time}ms`
    },
    _pad(num, n = 2) {
      let len = num.toString().length;
      while (len < n) {
        num = "0" + num;
        len++;
      }
      return num;
    },
    _getPosAndScale() {
      const targetWidth = 40;
      const paddingLeft = 40;
      const paddingButtom = 30;
      const paddingTop = 80;
      const width = window.innerWidth * 0.8;
      const scale = targetWidth / width;
      const x = -(window.innerWidth / 2 - paddingLeft);
      const y = window.innerHeight - paddingTop - width / 2 - paddingButtom;
      return {
        x,
        y,
        scale
      };
    },
    ...mapMutations({
      setFullScreen: "SET_FULL_SCREEN",
      setPlayingState: "SET_PLAYING_STATE",
      setCurrentIndex: "SET_CURRENT_INDEX",
      setPlayMode:'SET_PLAY_MODE',
      setPlaylist:'SET_PLAYLIST'
    })
  },
  watch: {
    currentSong(newSong,oldSong) {
        if(newSong.id===oldSong.id){
            return
        }
        if(this.currentLyric){
            this.currentLyric.stop()
        }
      setTimeout(() => {
        this.$refs.audio.play()
        this.getLyric()
      },1000);
    },
    playing(newPlaying) {
      const audio = this.$refs.audio;
      this.$nextTick(() => {
        newPlaying ? audio.play() : audio.pause();
      });
    }
  }
};
</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
@import '~common/stylus/variable';
@import '~common/stylus/mixin';

.player {
    .normal-player {
        position: fixed;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 150;
        background: $color-background;

        .background {
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            opacity: 0.6;
            filter: blur(20px);
        }

        .top {
            position: relative;
            margin-bottom: 25px;

            .back {
                position: absolute;
                top: 0;
                left: 6px;
                z-index: 50;

                .icon-back {
                    display: block;
                    padding: 9px;
                    font-size: $font-size-large-x;
                    color: $color-theme;
                    transform: rotate(-90deg);
                }
            }

            .title {
                width: 70%;
                margin: 0 auto;
                line-height: 40px;
                text-align: center;
                no-wrap();
                font-size: $font-size-large;
                color: $color-text;
            }

            .subtitle {
                line-height: 20px;
                text-align: center;
                font-size: $font-size-medium;
                color: $color-text;
            }
        }

        .middle {
            position: fixed;
            width: 100%;
            top: 80px;
            bottom: 170px;
            white-space: nowrap;
            font-size: 0;

            .middle-l {
                display: inline-block;
                vertical-align: top;
                position: relative;
                width: 100%;
                height: 0;
                padding-top: 80%;

                .cd-wrapper {
                    position: absolute;
                    left: 10%;
                    top: 0;
                    width: 80%;
                    height: 100%;

                    .cd {
                        width: 100%;
                        height: 100%;
                        box-sizing: border-box;
                        border: 10px solid rgba(255, 255, 255, 0.1);
                        border-radius: 50%;

                        &.play {
                            animation: rotate 20s linear infinite;
                        }

                        &.pause {
                            animation-play-state: paused;
                        }

                        .image {
                            position: absolute;
                            left: 0;
                            top: 0;
                            width: 100%;
                            height: 100%;
                            border-radius: 50%;
                        }
                    }
                }

                .playing-lyric-wrapper {
                    width: 80%;
                    margin: 30px auto 0 auto;
                    overflow: hidden;
                    text-align: center;

                    .playing-lyric {
                        height: 20px;
                        line-height: 20px;
                        font-size: $font-size-medium;
                        color: $color-text-l;
                    }
                }
            }

            .middle-r {
                display: inline-block;
                vertical-align: top;
                width: 100%;
                height: 100%;
                overflow: hidden;

                .lyric-wrapper {
                    width: 80%;
                    margin: 0 auto;
                    overflow: hidden;
                    text-align: center;

                    .text {
                        line-height: 32px;
                        color: $color-text-l;
                        font-size: $font-size-medium;

                        &.current {
                            color: $color-text;
                        }
                    }
                }
            }
        }

        .bottom {
            position: absolute;
            bottom: 50px;
            width: 100%;

            .dot-wrapper {
                text-align: center;
                font-size: 0;

                .dot {
                    display: inline-block;
                    vertical-align: middle;
                    margin: 0 4px;
                    width: 8px;
                    height: 8px;
                    border-radius: 50%;
                    background: $color-text-l;

                    &.active {
                        width: 20px;
                        border-radius: 5px;
                        background: $color-text-ll;
                    }
                }
            }

            .progress-wrapper {
                display: flex;
                align-items: center;
                width: 80%;
                margin: 0px auto;
                padding: 10px 0;

                .time {
                    color: $color-text;
                    font-size: $font-size-small;
                    flex: 0 0 30px;
                    line-height: 30px;
                    width: 30px;

                    &.time-l {
                        text-align: left;
                    }

                    &.time-r {
                        text-align: right;
                    }
                }

                .progress-bar-wrapper {
                    flex: 1;
                }
            }

            .operators {
                display: flex;
                align-items: center;

                .icon {
                    flex: 1;
                    color: $color-theme;

                    &.disable {
                        color: $color-theme-d;
                    }

                    i {
                        font-size: 30px;
                    }
                }

                .i-left {
                    text-align: right;
                }

                .i-center {
                    padding: 0 20px;
                    text-align: center;

                    i {
                        font-size: 40px;
                    }
                }

                .i-right {
                    text-align: left;
                }

                .icon-favorite {
                    color: $color-sub-theme;
                }
            }
        }

        &.normal-enter-active, &.normal-leave-active {
            transition: all 0.4s;

            .top, .bottom {
                transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32);
            }
        }

        &.normal-enter, &.normal-leave-to {
            opacity: 0;

            .top {
                transform: translate3d(0, -100px, 0);
            }

            .bottom {
                transform: translate3d(0, 100px, 0);
            }
        }
    }

    .mini-player {
        display: flex;
        align-items: center;
        position: fixed;
        left: 0;
        bottom: 0;
        z-index: 180;
        width: 100%;
        height: 60px;
        background: $color-highlight-background;

        &.mini-enter-active, &.mini-leave-active {
            transition: all 0.4s;
        }

        &.mini-enter, &.mini-leave-to {
            opacity: 0;
        }

        .icon {
            flex: 0 0 40px;
            width: 40px;
            padding: 0 10px 0 20px;

            img {
                border-radius: 50%;

                &.play {
                    animation: rotate 10s linear infinite;
                }

                &.pause {
                    animation-play-state: paused;
                }
            }
        }

        .text {
            display: flex;
            flex-direction: column;
            justify-content: center;
            flex: 1;
            line-height: 20px;
            overflow: hidden;

            .name {
                margin-bottom: 2px;
                no-wrap();
                font-size: $font-size-medium;
                color: $color-text;
            }

            .desc {
                no-wrap();
                font-size: $font-size-small;
                color: $color-text-d;
            }
        }

        .control {
            flex: 0 0 30px;
            width: 30px;
            padding: 0 10px;

            .icon-play-mini, .icon-pause-mini, .icon-playlist {
                font-size: 30px;
                color: $color-theme-d;
            }

            .icon-mini {
                font-size: 32px;
                position: absolute;
                left: 0;
                top: 0;
            }
        }
    }
}

@keyframes rotate {
    0% {
        transform: rotate(0);
    }

    100% {
        transform: rotate(360deg);
    }
}
</style>
